FIELD: sports equipment. SUBSTANCE: apparatus has two groups of radiation sources 1 and 5 and radiation receivers 2 and 6. First group is positioned in repulsion zone and second group is positioned in landing zone. Information processing unit 3 has signal selectors 8 and 10, computers 9 and 11, logic unit 18 and indicators. EFFECT: increased efficiency, convenient usage and enhanced reliability in operation. 7 cl, 6 dwg
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Authors
Dates
1996-11-20—Published
1987-04-16—Filed